Large Electromechanical Coupling Factors in Perovskite Binary Material System (<Special Issue> FERROELECTRIC MATERIALS AND THEIR APPLICATIONS)
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概要
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Similarities of large electromechanical coupling factors (k_s) in perovskite binary material systems were studied. Five large-k_s material systems, PZT 53/47, PZNT 91/9, PMNT 67/33, PSTT 55/45 and PSNT 57/43, were compared. These five large-ks material systems were found to show four similarities: rhombohedral and tetragonal morphotropic phase boundary (MPB), large polarization (P_r>25 μC/cm^2), proper B1 ionic size (70-72 pm) and large B2 ion (64 pm) in Pb(B1, B2)O_3 relaxors and proper B-site average ionic sizes of MPB composition (64.7-66.8 pm). For example, in this study, the maximum coupling factors (k_p=72%, k_<31>=45%, and k_<33>=77%) were obtained in Pb[(Sc_<1/2>Nb_<1/2>)_<0.57>Ti_<0.43>]O_3+0.005Nb_2O_5(PSNTN 57/43) piezoelectric ceramic materials.
- 社団法人応用物理学会の論文
- 1994-09-30
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- Large Electromechanical Coupling Factors in Perovskite Binary Material System ( FERROELECTRIC MATERIALS AND THEIR APPLICATIONS)